Centrifugal butter-extractor



(No Model.) 2 Sheets-Sheet 1.

0. OHLSSON. GBNTRIFUGAL BUTTER EXTRAGTOR No. 487,055. Patented Nov.- 29, 1892.

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' 0. OHLSSON.

GENTRIFUGAL BUTTER BXTRAGTOR. No; 487,055. Patented Nov. 29, 1892.

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4UNITED STATES PATENT OFFICE.

OLAF OHLSSON, OF ANEVARK7 NEW JERSEY.

CENTRIFU GAL BUTTER-EXTRACTO R.

SPECIFICATION' forming part of Letters Patent No. 487,055, dated November 29, 1.892. Application riad April 14, 1892. semina-129.111. (Nomea-.1.)

To a/ZZ whom it may concern:

Beit known that I, OLAF OHLSSON, a citizen of Sweden, residing at Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Butter-Extractors; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked there! on, which form a part of this specification.

The objects of this invention are to dispense with the operation of mechanically working the cream to break up the butter globules, to avoid the danger of overworking the butter and thus .impairing the quality and reducing the value of the same, to increase the capacity of the machines of this class, or to more rapidly make butter from a given amount of milk, and to secure other advantages and results, some of which will be hereinafter referred to in connection with the descriptions of the working parts.

The invention consists in the process of extracting butter and in the improved butter extractor or separator having the arrangements and combinations of parts, all substantially as will be hereinafter set forth, and nally embodied in the clauses of the claim.

Referring to the accompanying drawings, in which like letters indicate corresponding parts in each of the views, Figure l is a central vertical section of the improved machine, and Fig. 2 is a horizontal section of the same, taken at line In the drawings, a indicates a stationary cast-metal tank suitably supported, but the supports not being shown. Through the bottom of said tank a vertical shaft h extends into said tank, the latter providing bearings for the same of any ordinary construction. Upon said shaft b is arranged abowl @,which is of steel forgings to withstand centrifugal pressure brought thereon, and the same is made in sections riveted together.

The preferred method of construction is shown and is as follows: Upon the shaft b is formed a flange b', upon which is riveted the bottom section c' of the bowl. This said section is provided on the upper side thereof .with an inwardly-inclined ange o2, forming an inner bowl of small size. Outside of said inner bowl the bottom section c is extended,

as at c3, and provides a bearing on which the outer section c4 is riveted. This said section is also inwardly inclined to complete the'bowl. Thus two bowls are formed in connection with the rotary shaft, an outer bowl of comparative- 6o ly-large size and a smaller inner bowl the upper edges of which are below those of the outer bowl. Both bowls have inwardly -inclined walls and have central openings at the tops.

The marginal edge of the inner bowl projects to a point nearer to the center of the outer bowl than the vertical lines q of the creamwalls formed in said outer bowl, for a purpose hereinafter disclosed. The shaft b extends through the bottom section c and provides 7c a bearing or support for an inner cone d, the smaller end of which extends upward toward the mouth of the bowl c, while the base lies closely adjacent to the bottom c. Said cone is provided with fans d2, adapted to give rotary motion to the air around said cone and to force the same outward and, because of the shape of the chamber around said cone, downward. Around said cone, but lying a little from the walls thereof, is a stationary hollow 8o conc or cap e, which is fixed to an air-ductf,y extending up through top or cover g of the tank to a suitable refrigerator or coolingchamber.

Suitable means are provided for conveying 85 the milk from the reservoir h to the tank and for separating the cream from the skim-milk and the butter from the buttermilk. These devices are of any usual construction; but

mechanical means for churning the cream 9o and breaking the butter globules are dispensed with.

The preferred arrangements for conducting the iiuids and separating the butter therefrom are as follows: From the tank h the la into the larger bowl-chamber Z, having fans 10o or wings m to impart rapid rotary movement to the body of milk lying in the bowl-cham- Said pire. and prevents theorem from being:

thrown against the fans d2. Said screen tends to direct said cream so that it flows down the inside wall of the hollow cone in a thin lm. The rotary fan produces a suction, draws the cold air through the duct ffrom the refriger-a` tor, and directs it against the film of cream, rapidly cooling the same, and this action tends toA harden the butter and separate it from the buttermilk without mechanical churning. In this cooled condition thel cream flows int-o thesmaller chamber t of the bowl o2, andiy again` coming under the action of centrifugal forcethe buttermilk separates fromy the butter. The buttermilk-being'theheavieris forced outward through the tube n intoy the cham-v ber Z once more, where anybutter it may stilly contain is separated and mixes with the cream. The-butter in the chamber t is forcedy from the butter-wall 'u through the openingw into thebutter-chamber wf, where it is caught by the knife w2 and led to any suitable receptacle. By the construction described the milk is first brought under the influence of cen= trifugal force at a high temperature of, say,

80I Fahrenheit, and at this temjgierz'tture` the cream is rapidly separated from the skimmilk. The rapid change of temperature from 80 to, say,55is effective in separating or in bringing the cream in condition toy be separated vby the subsequent centrifugal ac tion. By this action all'danger of over workingor churning is avoided'. Thecool air follows the but-ter into the chambers t wf and passes out through the duct w3 back to there. frigerator. Inasmuch as but only a part ot' the milk is cooled instead of the whole, as in4 prior processes, the cost of cooling is much reduced.

Having thus described theinvention, what I claim as new is l. The process of extracting butter-from milk hereifndescribed, which consists inseparating the cream from the milk by rapidly rotating the same, then directingthe cream over-a suitable surface. iny a thin film in a separate chamber from the skim-milk and. subjecting it to the action of a rapidly-rotating air-current, and thus imparting rotarymovement to the creamv and buttery-particles therein, substantiallyas set forth.

2. In combination with the tank a, a shaft b, hav-ing a rotary bowl. thereon, a cone d, having' a Wing or. fan d2, a hollowcone forming a fan-chamber with the cone cZ, a duct f for cold air, and a passage or opening .5', providing a way for the cream into said fan-chamber, substantially as set forth.

3. In a centrifugal butter-extractor, the combination, with a larger rotary bowl, of a smaller rotary bowl having its upper edge project within the line of the cream-wall of the larger bowl', a duct for conducting the cream into the smaller bowl, a duct for conveying the buttermilk back into the larger' bowl, and a duct communicating with the lastmentioned duct for transmitting cold air thereto, and a passage for transferring the butter to the butter-chamber, substantially as set forth.

4. In combination, in a butter-extractor, a rotary shaft b, hav-ing outer and inner bowls thereon, the chamberI in the inner bow-l having communication with the outer bowl and a cream-,coolingt chamber disposedcentrally with relation tothe inner bow-land having communication with inner bowl to allow the cream to be conveyed`v or conducted to said inl-ner bowl, andl means, substantial-lyas-v'described, for cooling the cream, all lsubstan-V tially as and for the purposes set forth.

5. The process herein described of extracting butter, which consists in transferringthe cream from the creamseparating chamber to the butter separating chamber through a cooli'ngfchamber, in which it is subjected to rapidly-rotating cold air priorto subjecting it tothe butter-separatingoperation, substantially as set forth.

6. The process herein described, consisting in subjecting thecream tothe action of rapidlyfrotating cold air while said cream is spread in a thin film, then separating the butter therefrom, and then conducting the buttermilk to-a cream-chamber and subject ing said buttermilk to furthe-r rotary motion and extracting the butter more perfectly therefrom, substantially as set forth.

'7'.V lin combination with a rotary bow-l for separating cream from milk, a pipe orfcon-v duit fr for directing the cream to a coolingchamber, said cooling-chamber and a conduit for cold air leading thereto, anda centrifugal fan forgiving rotarymovement to the cooled air and throw-ing it outward against wall and against the cream gravitati-ng thereon, and a centrifugal butter-separating chamber com municating with said cooling-chamber, adapt;- ed to rece-ivethecooled cream from said cooling-chamber and subject the sameto cent-rifugal force, substantially as` set forth.

8. I'n a butter extracting or separating ma chine, the combination, with the rotarybowl, of cream-separating means at the outer-part of said bowl and at the-center of saidA bowl,I a cooling chamberor passage communicating with means for furnishing cold air andv cream, and a centrifugal cham-ber for separati-ng the butter from the cooled cream, substantially as set forth.

9. In a butter extrae-finger separating ma` chine, the combination, with a rotary bowl having win gs at the outer part forming cream- ICO In testimony that I claim the foregoing I have hereunto set my hand this 2d day of April, 1892.

OLAE` OHLSSON.

Witnesses: CHARLES H. PELL, OSCAR A. MICHEL. 

